Check-in procedures are the steps travelers follow upon arriving at an airport or hotel. For flights, this usually involves presenting identification and a booking confirmation at the airline's counter or using a self-service kiosk. Passengers may also need to check in their luggage and receive boarding passes before proceeding to security. In hotels, check-in typically requires guests to provide identification and a reservation confirmation. Staff will verify the booking, assign a room, and provide keys or access cards. Both processes aim to ensure a smooth arrival experience for travelers while maintaining security and organization.